-
公开(公告)号：US20090185655A1
公开(公告)日：2009-07-23
申请号：US11575662
申请日：2005-09-23
申请人： Peter Koken , Andy Ziegler , Michael Grass , Thomas Köhler , Roland Proksa
发明人： Peter Koken , Andy Ziegler , Michael Grass , Thomas Köhler , Roland Proksa
CPC分类号： A61B6/032 , A61B6/027 , A61B6/4028 , A61B6/4085 , A61B6/4291
摘要： A computed tomography method and apparatus are provided wherein a radiation source moves circularly relative to an examination zone about an axis of rotation (14). The radiation source produces a cone beam of x-rays and the focal point of this cone beam is switched between at least two positions (23a, 23b) spaced apart from each other and arranged on a line parallel to the axis of rotation to enlarge the reconstructable examination zone parallel to the axis of rotation. Preferably, the image of the examination zone is reconstructed using an iterative reconstruction method, in particular an algebraic reconstruction method or a maximum likelihood method.
摘要翻译： 提供了一种计算机断层摄影方法和装置，其中辐射源围绕旋转轴线（14）相对于检查区域循环移动。 辐射源产生X射线的锥形束，并且该锥形束的焦点在至少两个彼此间隔开的位置（23a，23b）之间切换并且布置在与旋转轴线平行的线上，以扩大 可重建检查区域平行于旋转轴。 优选地，使用迭代重建方法，特别是代数重建方法或最大似然方法来重建检查区域的图像。
-
公开(公告)号：US07426257B2
公开(公告)日：2008-09-16
申请号：US10552399
申请日：2004-04-02
申请人： Thomas Köhler , Michael Grass , Roland Proksa
发明人： Thomas Köhler , Michael Grass , Roland Proksa
IPC分类号： A61B6/03
CPC分类号： A61B6/541 , A61B5/1135 , A61B6/027 , A61B6/032 , A61B6/4085 , A61B6/503 , A61B6/504
摘要： The invention relates to a computer tomography method in which a periodically moving object, in particular an organ of the body, is irradiated by a cone-shaped beam cluster (4) along a trajectory which runs on a cylindrical surface. The radiation transmitted through the object is measured by means of a detector unit (16), and at the same time the periodic movement of the object is recorded. In order to reconstruct the absorption distribution of the object, the measured values or the corresponding beams are rebinned to form a number of parallel projections, where for each of these projections a measured value is determined whose beam irradiates the object. The point in time at which this measured value was acquired is allocated to the respective projection. For the reconstruction, which may for example be carried out using a filtered back-projection, only projections whose allocated points in time lie within a predefined, specific time range (H1) within a period of the object movement are used.
摘要翻译： 本发明涉及一种计算机断层摄影方法，其中周期性移动的物体，特别是身体的脏器被沿着在圆柱形表面上运行的轨迹由锥形束簇（4）照射。 通过检测器单元（16）测量透过物体的辐射，同时记录物体的周期性运动。 为了重建物体的吸收分布，将测量值或对应的光束重新组合以形成多个平行投影，其中对于这些投影中的每一个，确定其光束照射物体的测量值。 将获取该测量值的时间点分配给相应的投影。 对于可以例如使用滤波反投影来进行的重建，仅使用其分配的时间点在物体移动的时段内在预定义的特定时间范围（H 1）内的投影。
-
公开(公告)号：US06381298B2
公开(公告)日：2002-04-30
申请号：US09732587
申请日：2000-12-08
申请人： Roland Proksa , Michael Grass , Thomas Köhler
发明人： Roland Proksa , Michael Grass , Thomas Köhler
IPC分类号： A61B600
CPC分类号： H05G1/30 , A61B6/027 , A61B6/032 , A61B6/4085 , A61B6/4441 , A61B6/4464 , A61B6/583 , A61B6/585 , G01N23/04 , G06T11/006
摘要： Method and device for forming a 3D image of an object to be examined by combining at least two reconstruction images, acquired by an X-ray device, by weighted addition. Specifically, each reconstruction image is weighted with a respective weighting function which describes at least approximately the distribution of noise and/or the distribution of artifacts in the reconstruction image. The image quality of the resultant three-dimensional image is thus significantly improved.
摘要翻译： 用于通过组合由X射线装置获取的至少两个重建图像，通过加权相加来形成待检查对象的3D图像的方法和装置。 具体地，每个重建图像用相应的加权函数加权，该加权函数至少近似描述了重建图像中噪声的分布和/或伪影的分布。 因此，所得到的三维图像的图像质量显着提高。
-
公开(公告)号：US07545903B2
公开(公告)日：2009-06-09
申请号：US10564572
申请日：2004-07-07
IPC分类号： A61B6/03
CPC分类号： G06T7/20 , G06T11/005 , G06T2207/10081 , G06T2207/30048 , G06T2211/404 , G06T2211/412
摘要： In the CT imaging of non-homogeneously moving objects such as the heart or the coronary vessel tree, there is a problem that different parts of the objects are at rest at different points in time. Thus, a gated reconstruction with a globally selected time point does not yield a sharp image of such objects. According to the present invention, a motion of the objects is estimated, describing the motion of selected regions of these objects. Then, on the basis of the estimated motion, time points are determined, where these areas have minimal motion. Then, an image is reconstructed, wherein the data from which the respective regions are reconstructed, correspond to the respective time points, where the regions have minimal motion. Due to this, an improved image qualify maybe provided.
摘要翻译： 在诸如心脏或冠状血管树之类的非均匀运动物体的CT成像中，存在不同部分的物体在不同时间点处于静止状态的问题。 因此，具有全局选择的时间点的门控重构不会产生这样的对象的清晰图像。 根据本发明，估计对象的运动，描述这些对象的选定区域的运动。 然后，在估计运动的基础上，确定这些区域具有最小运动的时间点。 然后，重建图像，其中各个区域被重构的数据对应于各个时间点，其中区域具有最小的运动。 因此，可以提供改进的图像资格。
-
公开(公告)号：US20120045109A1
公开(公告)日：2012-02-23
申请号：US13266556
申请日：2010-04-09
申请人： Roland Proksa , Michael Grass
发明人： Roland Proksa , Michael Grass
IPC分类号： G06K9/00
摘要： A method includes decomposing, with a decomposer (118), agent-based time series projection data for an object or a subject into at least an agent based component. A projection data decomposer (118) includes a time series decomposer (204) that determines agent-based projection data based on agent-based time series projection data based on at least two energy dependent components. A computer readable storage medium containing instructions which, when executed by a computer, cause the computer to perform the act of: determining an agent-based component of agent-based time series projection data utilizing at least two components of the agent-based time series projection.
摘要翻译： 方法包括使用分解器（118）将用于对象或对象的基于代理的时间序列投影数据分解成至少基于代理的组件。 投影数据分解器（118）包括基于基于代理的时间序列投影数据基于至少两个能量相关分量来确定基于代理的投影数据的时间序列分解器（204）。 一种包含指令的计算机可读存储介质，所述指令在被计算机执行时使得所述计算机执行以下动作：使用基于代理的时间序列的至少两个组件来确定基于代理的时间序列投影数据的基于代理的组件 投影。
-
公开(公告)号：US20080205585A1
公开(公告)日：2008-08-28
申请号：US11912689
申请日：2006-04-25
申请人： Roland Proksa , Michael Grass
发明人： Roland Proksa , Michael Grass
IPC分类号： A61B6/00
CPC分类号： G01T1/2985 , G01N23/046 , G01N2223/419 , G01V5/0041 , G01V5/005
摘要： Spectral CT systems require cheap detectors with high energy resolution. According to an aspect of the present invention, a computer tomography apparatus comprises a detector element which is segmented into a plurality of sub-pixels. Each sub-pixel has at least two thresholds and counting channels, wherein the second threshold for each sub-pixel varies over the nominal detector element. This may provide for an improved energy-resolved photon counting.
摘要翻译： 光谱CT系统需要具有高能量分辨率的廉价检测器。 根据本发明的一个方面，计算机断层摄影装置包括被分割成多个子像素的检测器元件。 每个子像素具有至少两个阈值和计数通道，其中每个子像素的第二阈值在标称检测器元件上变化。 这可以提供改进的能量分辨光子计数。
-
公开(公告)号：US20060203955A1
公开(公告)日：2006-09-14
申请号：US10552399
申请日：2004-04-02
申请人： Thomas Kohler , Michael Grass , Roland Proksa
发明人： Thomas Kohler , Michael Grass , Roland Proksa
CPC分类号： A61B6/541 , A61B5/1135 , A61B6/027 , A61B6/032 , A61B6/4085 , A61B6/503 , A61B6/504
摘要： The invention relates to a computer tomography method in which a periodically moving object, in particular an organ of the body, is irradiated by a cone-shaped beam cluster (4) along a trajectory which runs on a cylindrical surface. The radiation transmitted through the object is measured by means of a detector unit (16), and at the same time the periodic movement of the object is recorded. In order to reconstruct the absorption distribution of the object, the measured values or the corresponding beams are rebinned to form a number of parallel projections, where for each of these projections a measured value is determined whose beam irradiates the object. The point in time at which this measured value was acquired is allocated to the respective projection. For the reconstruction, which may for example be carried out using a filtered back-projection, only projections whose allocated points in time lie within a predefined, specific time range (H1) within a period of the object movement are used.
摘要翻译： 本发明涉及一种计算机断层摄影方法，其中周期性移动的物体，特别是身体的脏器被沿着在圆柱形表面上运行的轨迹由锥形束簇（4）照射。 通过检测器单元（16）测量透过物体的辐射，同时记录物体的周期性运动。 为了重建物体的吸收分布，将测量值或相应的光束重新组合以形成多个平行投影，其中对于这些投影中的每一个，确定其光束照射物体的测量值。 将获取该测量值的时间点分配给相应的投影。 对于可以例如使用滤波反投影来进行的重建，仅使用其分配的时间点在物体移动的时段内在预定义的特定时间范围（H 1）内的投影。
-
公开(公告)号：US20050243962A1
公开(公告)日：2005-11-03
申请号：US10509932
申请日：2003-04-09
申请人： Michael Grass , Thomas Koehler , Roland Proksa
发明人： Michael Grass , Thomas Koehler , Roland Proksa
CPC分类号： A61B6/032 , A61B6/027 , G01N23/046 , G01N2223/419 , G06T11/005 , Y10S378/901
摘要： The invention relates to a computed tomography method in which a rebinning operation is carried out so as to form parallel fan beams whose rays traverse a plane, containing the axis of rotation, in equidistant puncture points. Reconstruction is performed for rays which extend perpendicularly to said planes. Such a transition from a cone beam geometry to a parallel beam geometry enables very fast reconstruction which can be carried out notably for CT fluoroscopy.
摘要翻译： 本发明涉及一种计算机断层摄影方法，其中进行重组操作以形成平行扇形束，其平行扇形束横穿包含旋转轴线的平面在等距穿刺点中。 对垂直于所述平面延伸的射线进行重建。 从锥形束几何形状到平行光束几何形状的这种过渡使得能够非常快速地重建，这可以用于CT荧光透视。
-
公开(公告)号：US20110096892A1
公开(公告)日：2011-04-28
申请号：US12996985
申请日：2009-06-01
申请人： Peter Forthmann , Udo Van Stevendaal , Ewald Roessl , Michael Grass , Roland Proksa , Jens-Peter Schlomka
发明人： Peter Forthmann , Udo Van Stevendaal , Ewald Roessl , Michael Grass , Roland Proksa , Jens-Peter Schlomka
IPC分类号： H05G1/60
CPC分类号： A61B6/405 , A61B6/032 , A61B6/4014 , A61B6/4035 , A61B6/4042 , A61B6/4241 , A61B6/482
摘要： An imaging system includes a radiation source (106, T1, T2, T3) that rotates about an examination region and emits radiation that traverses the examination region. The radiation source (106, T1, T2, T3) emits radiation having an energy spectrum that is selectively alternately switched between at least two different energy spectra during an imaging procedure. The system further includes an energy-resolving detector array (116, D1, D2, D3) that detects radiation traversing the examination region. The energy-resolving detector array (116, D1, D2, D3) resolves the detected radiation over at least two different energy ranges and produces energy-resolved output signals as a function of both emission energy spectrum and energy range. The system further includes a reconstructor (126) that performs a spectral reconstruction of the energy-resolved output signals. In another embodiment, the detector array (116) includes a photon-counting detector array (116).
摘要翻译： 成像系统包括围绕检查区域旋转并且发射穿过检查区域的辐射的辐射源（106，T1，T2，T3）。 辐射源（106，T1，T2，T3）发射具有在成像过程期间在至少两个不同能量谱之间选择性交替切换的能谱的辐射。 该系统还包括检测穿过检查区域的辐射的能量分辨检测器阵列（116，D1，D2，D3）。 能量分辨检测器阵列（116，D1，D2，D3）通过至少两个不同的能量范围来解析检测到的辐射，并且产生作为发射能量谱和能量范围的函数的能量分辨的输出信号。 该系统还包括执行能量分辨输出信号的频谱重建的重建器（126）。 在另一个实施例中，检测器阵列（116）包括光子计数检测器阵列（116）。
-
公开(公告)号：US07924972B2
公开(公告)日：2011-04-12
申请号：US12471511
申请日：2009-05-26
IPC分类号： A61B6/03
CPC分类号： G06T7/20 , G06T11/005 , G06T2207/10081 , G06T2207/30048 , G06T2211/404 , G06T2211/412
摘要： In the CT imaging of non-homogeneously moving objects such as the heart or the coronary vessel tree, there is a problem that different parts of the objects are at rest at different points in time. Thus, a gated reconstruction with a globally selected time point does not yield a sharp image of such objects. According to the present invention, a motion of the object is estimated, describing the motion of selected regions of these objects. Then, on the basis of the estimated motion, time points are determined, where these areas have minimal motion. Then, an image is reconstructed, wherein the data from which the respective regions are reconstructed, correspond to the respective time points, where the regions have minimal motion. Due to this, an improved image quality may be provided.
摘要翻译： 在诸如心脏或冠状血管树之类的非均匀运动物体的CT成像中，存在不同部分的物体在不同时间点处于静止状态的问题。 因此，具有全局选择的时间点的门控重构不会产生这样的对象的清晰图像。 根据本发明，估计对象的运动，描述这些对象的选定区域的运动。 然后，在估计运动的基础上，确定这些区域具有最小运动的时间点。 然后，重建图像，其中各个区域被重构的数据对应于各个时间点，其中区域具有最小的运动。 由此，可以提供改善的图像质量。
-
-
-
-
-
-
-
-
-
搜索结果
247 条记录 (耗时 0.026 秒)